DE1597920A1 - Automotive headlights - Google Patents

Description

R. 8985
27.9.1967 Sr / km

Plant ^r /.\ir

R O 13 Ji R T BOSC H. GMBH, Stuttgart W, BreitscheidatraBse 4 Motor vehicle headlights

The Br find us relates to a Kraftfahraeugncheinwerfer with aijnera reflector and at least one "lublaiape. In servants arranged (and from remote lighting" uf Abblendbeleuchtung and vice versa umnennt tbaron UlUhwondelri of which & ir is assigned a Abbltndachirm before Fernliohtglühwendel Abblenülicht / jlUhwendel.

In such cases, the cover flaps are shaped by their shape ^ inurj groUtn lUni'luö on the quality of the low beam. When not Correctly forged visors can result in that BATH ORIGINAL

i *

Robert Bosch GmbH _{p ftQft} , ^ / V _n

Stuttgart .R. 8985 or / km

Cause glare · and thereby reduce the quality of the low beam. Ks is already known to have anti-glare screens inside with a To provide blackening. This "but" becomes part of the filament emitted light 'and not its original Purpose of illuminating the road, made usable.

The invention is based on the objective to improve the quality of the low beam and at the same time to bring more light to the road. At the same time, glare of oncoming people should be avoided.

■ j

According to the invention, these objects are achieved by such a training the Abblenuschirms solved that perpendicular to the optical axis Cross-sections of the same at least approximately parabolic cutting edges and cross-sections running in horizontal planes the same have at least approximately elliptical cutting edges that are smaller than the corresponding half ellipses. Is there on of advantage if the low beam filament at least approximately in the focal point of at least one parabola and in a focal point one Ellipse of the cross-sections mentioned runs and is arranged in such a way that the last glowing turn facing the reflector unit, preferably running in the direction of the longitudinal axis of the reflector Low beam filament at least approximately in the mower the Kl 1.1pijenbrennpunktea lies.

The invention is based on an example of a guide shown in the drawing in the following description, in which further details of the invention can also be found.

Eb ηοigenϊ

Pig. 1 is the through the optical axis of a perspective and nchoic!

ilorizontixlochnitt,
\ ^f iß. · 2 don Vοrtikaisch section through the optioche axis, in dom ledigt ii.'h the two oil filaments and uüv the Abbleridllehtglühwriidol /,ur.uoriinete shielding screen are durgoatelIt.

009835/0360 " ³ "

BATH

Hobort houchCJrabH R. 8985Sr / Km

Stuttgart. . - ¹ ^ '.

Pip,. j> the front view of the cover cap with the Abbiendlich incandescent filament.

Pi-. 4 the top view of the two filaments with dimming irm.

In the figures, there are individual rays of light emanating from the filament drawn.

The use of a headlight shown in Fig. 1 has a Reflector 1, which is covered with a lens 2. The remote lighting the high-beam filament 3 »serves, which runs transversely to the optical axis 0-0 and intersects the focal point 4 of the reflector. The coreJ ight glowing bulb can also in the longitudinal direction of the axis or be arranged in a u-shape around the focal point. Before the! '' Ernlichtglühwendül the dimming filament 5 is shown running in the direction of the optical axis. The low beam filament is a Abi · lend shield 6 assigned to the downward from the low-beam incandescent filament shields emitted light rays and reflects them in the upper part of the reflectorB.

The anti-glare screen is designed in such a way that the cross-sections running perpendicular to the optical axis have at least approximately parabolic cutting edges and cross-sections of the same, running in horizontal planes, have at least approximately elliptical cutting edges that are smaller than half in 1 ⁽ Fig. 4 ElIiρπυ 7, partially indicated by dash-dotted lines. The AbblondlichtglühwondcI b is arranged in α or ΜΙίρθβ in such a way that it runs towards the] ek torscheitcl; 1 finite incandescent filament the focal point F facing the kuf jector 'apex of the ellipse intersects, otheri'.ei t: s is the dipped lampshade of the low-beam light filament in the wetüo z-ußirordnot that the' longitudinal axis of the low-beam filament, which is identical to The reflector axis 0-0 int, which intersects the focal points of the parabola 10, which, arranged one behind the other, show the shape of the Abi! 'iiie.'i in the in Fig. 3 determine the view provided.

BADOWÜINAl ₀ 0ϋ3δ / 03β0

Kobe Ms bosoh GmbH H..8985 Sr / Km

Stuttgart '

Uiυ upper edge 9 of the side screen is only so high that the dimming J.ifihtgiühweridel can illuminate the entire upper part of the reflector. Only the one between the high beam filament 3 and the Abbüorid light filament 5 lying part 1 I of the shield 6 is slightly higher than the rest of the same, so that the Pernweridel of the blonde filament cannot be illuminated.

In addition, the light rays drawn in FIGS. 2 to 4 show that the light incident from the filament on the edge of the lobe is for the most part reflected in directions in which 3io no longer reach the reflector, but leave it without further reflection through its opening. 3> which shows the screen in the axial direction, discloses that the in the AbI) light falling on the screen is reflected upwards. Of the Anti-glare screen forms in everyone! " vertical section the shape of a Parabola, the focal point of which intersects the dipped glowing bulb. Since the The shade has different cross-sections, the parabolas are also different in size. The light reflected upwards, from which only a small part falls on the reflector does not cause any Glare because it is not used to form the HeI I dark boundary.

The ' Fig! The screen is open at its front edge 12 in the exit direction of the reflector and has no screen wall there. As a result, the light reflected by the dome is directed in the direction of the. Reflector rim ·; and leaves it through the outlet opening.

The same effect as with the anti-glare screen described can also be achieved with oinc; ii those that are elliptical in plan view; and in its V'erti kalachnit ten parabola shape-like cross-sections uufwuittt. In particular, the For ¹ KiUη similar to the parabola in Niiho der. üchoi te.Lpunkteo the parabola be circular. The shield can also no v arranged o, Dau the foci dor l'arabuln opposite the Abblend.licht iLühwendel-up or a wnnig are crosslinked below.

009835/0360

BATH

Claims (1)

Expectations 1. Ki'nl'trahr / iOugiicheinwerL'er with a reflector and with at least one incandescent lamp disordered in the serving and from l ^{| J} er lighting to low beam and vice versa switchable incandescent filaments, of which the low beam arranged in front of the high beam filament A dimming screen is assigned to a glow filament, characterized by such a design of the dimming screen that the cross-center of the dimming screen running perpendicular to the optical axis only approximates a few parabolic cut edges and cross-sections running in horizontal planes at least "! elliptical üahnittkanten aufwe * n _t the smaller and 'ί the ¹ tfur.uliürifljö hulbe Ellipee. 2. headlight according to claim 1, characterized in that uchnibte | n vertical Bohnittebenen in the vicinity of the log »! the i'avabeln have circular sonic edges 1 " ücheinwei'for according to claim 1 odej? j2, 4 ^s 4 characterized by, ύ the low-beam filament is almost at the focal point woni /; M ten # of a parubule and in Hntfli BrennpUbJct an if} 11 pee dor ^ ononftten Querochnitto after Aneprueh 3, daduröh ßekennioichnot that the kturticheitel facing letite / jlithondc turn of advantages * in l.'iohtun ^ Uor Liln ^ aachee de »KeClektoro trending; BATH ORIGINAL 009835/0360 Robert Bosch GmbH ■ _; _/ -_. 8985'Sr / Km - Stuttgart _t . -, 597920 Low beam filament at least approximately in the vicinity of the i'i ll Lpsen focal point. 5. Headlight according to claims 1 to 4 * characterized in that that the shielding cap is open in the exit direction of the light. . - 6. Headlamp according to claims 1 to _t j ^l characterized in dal.) Of the lying between high beam and dipped beam incandescent filament portion of the cap skirt-up is the same as the remainder of BATH Blank page ;. ^{: i} iS